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Photoelectrochemical Behavior of Sn‐Doped α ‐Fe 2 O 3 Photoanode with Different Reducer
Author(s) -
Cai Jiajia,
Liu Yinglei,
Li Song,
Gao Meiqi,
Qin Gaowu
Publication year - 2016
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201600204
Subject(s) - hematite , chemistry , photocurrent , electrolyte , semiconductor , photoelectrochemistry , doping , adsorption , water splitting , chemical physics , chemical engineering , nanotechnology , photocatalysis , optoelectronics , electrode , electrochemistry , mineralogy , materials science , catalysis , engineering , biochemistry
Hematite has been considered as one of the most promising photoanode candidates for solar water‐splitting. However, its photoelectrochemical (PEC) efficiency is largely constrained by its sluggish oxygen evolution reaction. In this work, the photoelectrochemical performance of hematite was investigated in electrolytes containing different sacrificial agent. The photocurrent densities, onset potential, charge transfer resistance, Helmholtz capacitance at semiconductor liquid junctions (SCLJs), and their correlations were systematically studied. It was found that the onset potential is around the C H peak potential and is related to the photovoltage. The surface states pinning the Fermi levels of the hematite photoanode are related to the adsorbed water molecules regardless of the sacrificial agents in the electrolyte.